$300,000 Mortgage at 4.5% for 30 Years
Monthly payment breakdown for a fixed-rate 30-year home loan.
Monthly Payment
$1,520
Principal: $300,000 · Rate: 4.5%
| Item | Amount |
|---|---|
| Loan Principal | $300,000 |
| Total Interest (30 years) | $247,220 |
| Total Paid | $547,220 |
Amortization Schedule (Yearly Summary)
How your payments are split between principal and interest each year.
| Year | Principal Paid | Interest Paid | Remaining Balance |
|---|---|---|---|
| 1 | $4,840 | $13,401 | $295,160 |
| 2 | $5,062 | $13,179 | $290,098 |
| 3 | $5,295 | $12,946 | $284,804 |
| 4 | $5,538 | $12,703 | $279,266 |
| 5 | $5,792 | $12,448 | $273,474 |
| 6 | $6,058 | $12,182 | $267,415 |
| 7 | $6,337 | $11,904 | $261,079 |
| 8 | $6,628 | $11,613 | $254,451 |
| 9 | $6,932 | $11,308 | $247,519 |
| 10 | $7,251 | $10,990 | $240,268 |
| 30 | $17,804 | $437 | $0 |
Rate Comparison — $300K Loan
Understanding a $300K Mortgage at 4.5%
A $300,000 fixed-rate mortgage at 4.5% interest over 30 years results in a monthly payment of $1,520. Over the full loan term, you will pay $247,220 in interest — roughly 0.8× the original loan amount.
In the early years, most of your payment goes toward interest. By year 10, approximately $7,251 of your annual payments go to principal and $10,990 to interest. Over time, the balance shifts as the principal portion grows.
Frequently Asked Questions
What is the monthly payment on a $300,000 mortgage at 4.5%?
The monthly payment on a $300,000 mortgage at 4.5% interest for 30 years is $1,520. Over the life of the loan, you will pay $247,220 in interest, for a total of $547,220.
How much total interest will I pay on a $300,000 mortgage at 4.5%?
On a $300,000 mortgage at 4.5% over 30 years, you will pay $247,220 in total interest. This means you pay roughly 0.8x the original loan amount in interest alone.
How does 4.5% compare to other mortgage rates?
At 4.5% on a $300,000 30-year loan, the monthly payment is $1,520. A 0.5% rate decrease would save approximately $88/month, while a 0.5% increase would add about $90/month.
How This Is Calculated
This page uses the standard fixed-rate amortization formula to compute the monthly mortgage payment:
M = P × [r(1+r)n] / [(1+r)n − 1]
Where P = $300,000 (loan principal), r = 0.003750 (monthly interest rate = 4.5% ÷ 12), and n = 360 (total payments = 30 years × 12 months).
Standard amortization formula. Assumes fixed-rate loan, no PMI, taxes, or insurance.
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⚠️ Estimates only. Actual mortgage costs may include PMI, property tax, insurance, and HOA fees. Consult a lender for precise figures.